feature: Improve search functionality

[Pritam Das]

Feature:

1. The search bar only gives videos as search results, it would be nice if people could search the notes as well from the search bar

2. Using the mouse to go to the search bar and manually navigating is tedious. A simple keyboard navigation could be added that lets the user search and navigate the results using keyboard only.

Solution:

I would like to modify the logic of search api route so that it also gives the notes as output. I have also made the searchbar navigable using only the keyboard